ANALYSIS OF DISTURBING FORCES REASONS PROVOKEN THE RECIRCULATION PIPELINES ENHANCED VIBRATION OF SPRINKLER SYSTEM OF NPP’POWER UNIT
DOI:
https://doi.org/10.20535/2305-9001.2013.67.37874Keywords:
throttling devices, perforated flag (grate), protecting from destroying dynamic influence of the throttled streamAbstract
Large local overfall of pressure, in regulative organs and, especially, in the throttling devices can be ac-companied by the unstationary processes related to pulsations of static and complete pressures. These processes are not studied with necessary plenitude and can create dangerous revolting forces excitanting resonance vibrations of pipelines. Indignations can arise up: in the areas of local stream tearing, because of unstationary of stream behind throttling device and by reason of «cork» character of flow.
The calculation analysis of liquid expiration through the throttle puck of d0=0,0478[м] diameter shows that this device in combination with the speсial form of opening edge and set temperature of liquid t = 150С, are formed conditions, at which speed of stream in the output section increases considerably, that conduces to considerable falling of static pressure behind throttling device up to pressure below pressure of satiation at this temperature. The analysis of changing of the internal diameter influence is executed within the limits of 0,03 to 0,1 [м] on character and parameters of stream motion behind throttling device at the same initial parameters. The results of calculation researches were confirmed by experimental researches on the specially developed unit. On the working area of unit scale models were set: standard and alternative throttling devices, and also throttling device as the perforated flag (grates). On the basis of the got results of researches, three variants of technical decisions of defence from destroying dynamic influence of throttling stream as impermissible vibration of pipelines are developed and groundedReferences
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